Smoke arresting and consuming apparatus.



No. 851,333. PATENTED APR. 23, 1907.

W. M. ABBOTT.

SMOKE ARRESTING AND GONSUMING APPARATUS, APPLICATION FILED SEPT. 5, 1905. RENEWED MAR.'14,1907.

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UNITED STATES PATENT UFFIGE.

SMOK E ARRESTING AND CONSUIVIING APPARATUS.

Specification of Letters Patent.

Patented April 23, 1907.

Appli ation filed September 5. 1905. Renewed March 14, 1907. Serial No. 362.412.

To all whom it nub concern.-

Be it known that I, NARREN M. ABBOTT, a citizen of the United States, and a resident in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Smoke Arresting and Consuming Apparatus, reference being had to the accompanying drawings, in which Figure 1 illustrates a longitudinal vertical section of a boiler and furnace embodying the invention; Fig. 2 illustrates a transverse vertical section taken on the line 11 of Fig. 1; 3 illustrates a detail showing the construction of the smoke arresting tube.

Generally stated, my apparatus embodies a semi-cylindrical tube or device arranged transversely of the furnaceupon the top of the bridge wall and near its front end. Y At one end air is supplied through a. suitable conduit from the exterior of the furnace and opposite this air supply is a draw-oil conduit or pipe, whereby the smoke and unconsumed products of combustion are drawn first upwardly and then forwardly to or near the front of the furnace and are then discharged into a transverse pipe or conduit, which is supplied with discharge nozzles opening downwardly toward the fire upon the grate bars. Behind this conduit is arranged another transverse conduit or pipe, which is connected with a steam superheater, whereby dry steam is blown through the first named conduit, whereby the unconsumed products of combustion are discharged through the nozzles, as above stated. The

superheater is, or may be placed in one cor ner, or in any desired part of the furnace, and is supplied with steam from the dome of the boiler.

Referring now to the drawings, A represents the fire pot of the boiler, B the ash pit, C the flue beneath the boiler, D the stack, E the boiler itself, which may be of any preferred construction, F the steam dome, G the grate bars, H the firing door, I the ash door.

.These parts may be of any usual, or preferred construction.

J is What I term the smoke arrester. Its construction and form is shown best in Fig. 3, that is to say, it has throughout the greater part of its length, a semi-cylindrical form, in other words, it embraces a little more than a half circle and has an open top. Near one end, as at K, it is closed, that is to say, the metal is continuous, making a pipe of it, and at its lower side an air supply pipe L enters it.

This pipe extends from the front of the furnace casing, where it may be provided with a funnel shaped intake 1/, rearwardly by the side of the grate bars or between the last grate bar and the wall of the furnace, and thence through the brickwork of the bridge wall, as shown at U. From the upper side of the smoke arrester opposite the air supply pipe L, is the smoke. witlulrawing pipe M,

which may rise upwardly by the side of the furnace to or near the bottom of the boiler, as shown in Fig. 1, and thence forwardly to the front of the boiler where it descends, as at M, (see Fig. 2) and connects with the transverse conduit or smoke receiver N, which is as a matter of fact, nothing more than a right and left extension of the smoke withdrawing pipe M. This receiver is supplied with a series of discharge nozzles O, O, which are arranged to discharge downwardly upon the fire on the grate bars beneath.

P is the superheatcr of any suitable construction, which may be arranged in any suitable and usual manner. I prefer to place it in one corner of the furnace, as shown. A supply pipe Q, which com'lects with the steam dome F, supplies steam to the superheater and a pipe .lt leads away therefrom, which connects with a transverse steam pipe S, which is preferably of substantially the same length as the smoke receiving conduit or pipe N, and lies in close proximity to it. There are openings T (see Fig. 2) connecting this superheated steam pipe S with the smoke receiving conduit N, and these openings are located immediately opposite the discharge nozzles O, O, on the pipe N.

The operation is as follows: As the products of combustion pass upwardly from the furnace, the unconsumed parts thereof, in other words, the smoke, are underneath and the lighter and less sluggish. gases, etc., are uppermost, sweeping lengtlnvise along the underside of the boiler. Moreover just at, or slightly beyond the edge of the bridge wall, there is what may be called an eddy of more or less pronounced character, depending upon circumstances, occasioned. by the downward curl of the products of comlmstionas they pass over the projecting edge of the bridge wall. Just at this point I locate my smoke arrester with its open side presented upwardly. Its exact location relative to the edge of the bridge wall will be a matter of adjustment, depending somewhat upon the draught and upon the character of the fuel ICC) IIO

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employed. Sometimes it may beneficially be placed directly upon the edge of the bridge wall, as illustrated in the drawings, and sometimes slightly in rear or toward the stack therefrom.

The smoke arrester may be semi-cylindrical in form, as above described, but I prefer that it should taper or outwardly flare soi-newhat from the end Where the cold air inlet pipe L and the smoke conveying pipe M enter it, toward the opposite end, and I also prefer that adjacent to these pipes the smoke arrester should be enclosed, in other words, be a complete pipe, as shown by the parts K, K, in Fig. 3. The area of this enclosed or complete pipe section may differ as desired. I find. that good results are achieved when substantially one third to one quarter of the total length of the smoke arrester is covered or enclosed, but there is no definite area essential. All that is requisite is that enough shall be so constructed as to give suitable draught to the smoke conveying pipe M.

The smoke and heavier or more sluggish products of combustion, as before stated, as they pass up over the edge of the bridge wall, fall into, or are drawn into the smoke arrester and in as much as there is a very strong draught upwardly through the conduit M, induced at one side by the action of the superheated steam, as will be explained in a moment, and at the opposite side by the air supply pipe L, the smoke and other products are quickly drawn cross-wise of the bridge wall into the conduit M, and thence forwardly to the front of the furnace, where by the action of the continuous jets of superheated steam, they are ejected through the nozzles O, O, downwardly and directly upon the front of the fire in the furnace, where they are completely consumed.

The apparatus will operate satisfactorily without any steam blast aiding the draught and the ejectment of the smoke and unconsumed products from the pipe M, but I prefer to employ a steam blast, because thereby the operation of the apparatus is rendered more effective, certain and reliable. I prefer also that the steam should be superheated, because thereby the heat of the fire is increased rather than otherwise, and the more perfect combustion of the smoke, when it encounters the fire, is assured.

Of course the apparatus is provided with suitable supply cocks, dampers and other devices usual in such apparatus, which are too well-known to require illustration or description.

It will be obvious to those who are familiar with this art that the special method of arranging the devices above described and illustrated in the drawings is unimportant. They are given as one form only of many in which the parts may be arranged and specifically constructed. All that is essential 1s that the parts specified in the following claims shall be present, suitablyco-acting with each other to effect the desired result.

It will be noted that my apparatus is exceedingly simple and inexpensive -in installation, that it is not likely to get out of repair, and that since it effects complete combustion of the fuel, there is a very considerable saving in coal account and furthermore that it in no wise interferes with the operation of furnaces as now constructed and requires no manipulation or attention if once properly adjusted.

I claim:

1. In a furnace the combination of an open top conical conduit arranged transversely of the bridgewall, an air supply pipe proceeding from the outside front of the furnace rearwardly and connecting from below with said conduit, a smoke conveyer connected with the conduit opposite the air supply pipe and rising vertically from the conduit for a space and proceeding thence to and transversely across the front of the furnace, and provided in its transverse section with discharge openings, a superheater, a steam pipe connected with the superheater and which extends therefrom parallel with the transverse section of the smoke conveyer and which is provided with openings connecting it with the smoke conveyer opposite the discharge openings in the latter.

2. In a furnace the combination of an open top conical conduit arranged transversely of the bridgewall, the smaller end of which conduit is tubular, an air supply pipe proceeding from the outside front of the furnace rearwardly and connecting from below with the" tubular part of the conduit, a smoke conveyer connected with the tubular part of the conduit opposite the air supply pipe and rising vertically from the conduit for a space and proceeding thence to and transversely across the front of the furnace above the firing door, the transverse section whereof is provided with discharge openings having nozzles, a steam pipe connected with the steam dome, and which passes thence into the furnace parallel with and above the transverse section of the smoke conveyer and which is provided with openings connecting it with the smoke conveyer opposite the discharge nozzles thereof and a superheater in said steam pipe located between the steam dome and said openings therein.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WARREN M. ABBOTT.

WVitnesses:

R. M. KELLY, WM. L. RooNEY. 

